It's a handheld type ID card reader/writer with small size. 125KHz RFID EM format card copier/duplicator with 5 writable cards and 5 key fobs.

Features:
Designed to read 125KHz RFID cards and write/program 125KHz writable RFID cards.
Operates without the need of PC or laptops, works completely standalone.
Handheld mini appearance, easy to carry, easy to operate.
Lower voltage operation design, powered by 2pcs AAA batteries(not included).
Simply press the button to "read" existing RFID card. Then, press another button to "write" or program your blank RFID card.
The included programmable RFID cards are completely reusable-can be written over and over again.
Perfect for cloning existing RFID pass cards and key fobs (please use in a legal way).

Specifications:
Color: White
Material: ABS Plastic
ID Card: 5pcs
Key Fob: 5pcs
Power: 2 * AAA Batteries(not included)
Operation Range: up to 3cm
Support Card: EM ID card or EM 4100 compatible REID cards
Audio/Visual Indication: Green LED Backlight and Buzzer Signal Output
Temperature: -10 Degrees Celsius to +70 Degrees Celsius
Humidity: 5%-95% Relative Humidity Non-condensing
Item Size: 104 * 40 * 14mm / 4 * 1.57 * 0.55in (L * W * H)
Item Weight: 27g / 0.97oz
Package Size: 13.5 * 9 * 3cm / 5.3 * 3.54 * 1.18in (L * W * H)
Package Weight: 113g / 4oz

Package List:
1 * ID Card Reader/Writer
5 * ID Cards
5 * Key Fob
1 * User Manual (English)